Q: What is the difference between an inferior work of Norishige and a masterpiece of the Uda school?
A: Norishige has a reputation as a great master, one of the best. Uda has a reputation as a second or third tier school. Even the best work of a third tier school will not compare to the worst work of a grand master. And even if it does, the top makers will gain attributions of master works and the lesser works will be attributed to lesser makers. Quality is the first step of attribution.